Supersnelle erbijsommen en erafsommen tot 20
In de mix
|
1.
4 – 0 =
3
4
1
2
|
2.
2 + 7 =
1
9
3
2
|
3.
9 + 10 =
19
3
2
4
|
4.
15 + 3 =
4
18
3
2
|
|
5.
6 + 14 =
20
4
2
3
|
6.
13 – 3 =
2
1
10
3
|
7.
16 – 13 =
1
2
3
4
|
8.
20 – 5 =
2
15
1
3
|
|
9.
10 – 8 =
1
4
2
3
|
10.
3 + 10 =
1
13
2
3
|
11.
10 – 7 =
1
3
4
2
|
12.
17 + 3 =
2
20
3
4
|
|
13.
12 – 3 =
2
9
3
1
|
14.
9 + 8 =
2
17
4
3
|
15.
15 + 5 =
20
4
2
3
|
16.
9 + 0 =
2
1
9
3
|
|
17.
11 – 0 =
2
11
3
1
|
18.
18 – 9 =
9
2
1
3
|
19.
3 – 0 =
3
4
2
1
|
20.
19 – 0 =
19
3
2
4
|